Question

cos x/4+корень из 2/2=0

Answer 1

cosx/4=-√2/2

х/4=±3п/4+2пk

x= ±3п+8пk, k-целое

Answer 2

cos(x/4) + √2/2 = 0

cos(x/4) = - √2/2

x/4 = ± 3π/4 + 2πn

x = ± 3π + 8πn , n ∈ Z

ОТВЕТ: ± 3π + 8πn , n ∈ Z